Spraypainting
Survivors have the ability to spraypaint the walls of any block, leaving a message visible by any character standing in the same spot. Every type of block has suitable surfaces available, and buildings can be graffitied on the inside walls as well. The graffiti will appear as Somebody has spraypainted ... onto a wall, where ... is replaced by whatever text you enter; up to 50 characters. Spraypainting costs 1ap, unless you are spraypainting a Billboard where the cost is raised to 10ap.
In order to spraypaint, a player must be carrying a Spray Can. For each message you leave, there is a chance that the spray can will run out. Attempting to spraypaint something vulgar will cause the spray can to to run dry before anything is even written, wasting both the item and the AP.
Painting over an existing message will overwrite that message with the new one. It is possible to improve the appearance of an existing message by spraying the identical words repeatedly; however, there is no known in-game benefit to doing so.
Remember that Zombies can still read messages you spray.
The Tagging skill gives experience for spraypainting certain types of blocks or buildings, and makes spray cans last longer.
There is also a Great Graffiti hall of fame where amusing, famous or otherwise memorable graffiti is immortalized.
